Another of these factors is infertility. Generally, female gorillas mature at 10â12 years of age (or earlier at 7â8 years) and their male counterparts mature more slowly, rarely strong and dominant enough to reproduce before 15â20 years of age.
A herniated disk, sometimes (incorrectly) called a slipped disk, is a common cause of severe back pain and sciatica. A disk in the lumbar area becomes herniated when it ruptures or thins out, and degenerates to the point that the gel within the disk (the nucleus pulposus) pushes outward.
Weak Piriformis Muscle Can Cause Back Pain, Sciatica. The piriformis muscle deep in the buttocks has gotten a lot of attention as a possible back pain and sciatica cause. The muscle stretches from the top of the femur to the sacrum on each side of the body and helps secure the upper thigh in the hip joint.